the police commissioner here topresidentobamapromisesto find out who is behind these bombings and they all say they will be brought to justice. two bomb blasts less than 15 seconds apart near the finish line of the boston marathon. three people dead, 144, at least 144 others wounded. 17 of those are in critical condition this morning. and boston's normally bustling downtown area is now a crime scene. about a mile of boylston street, one of the busiest streets in the city with copley place, the boston public library, other locations, that is shut down this morning. it is a crime scene. national guard patrolling the streetsment you can see police out walking on the sidewalk. president obama is promising the full weight of justice for whoever is responsible for the bombing at this race. the president didn't use the word terror when he addressed the media last night at the white house. but he made it clear that the u.s. will hunt down the culprit. he also reached out to congressional leaders saying this is a time for unity among americans. cnn's brianna keilar is standing by at th

this morning.presidentobama, welearned, will travel to boston tomorrow. he will attend an interfaith service for the victims of the bombings and their families. for more on the president's plans and his visit to massachusetts, let's go to white house and our white house correspondent brianna keilar. good morning. >> reporter: president obama, we learned yesterday, will travel to boston tomorrow for this interfaith memorial service dedicated to those who were injured or killed in the boston bombings. this will be at the cathedral of the holy cross in boston. president obama, no doubt, preparing for what will be an emotional event. he will be striking a tone as consoler and chief, something we have seen at the white house. we heard him yesterday talking about the people who ran the marathon in boston, after the bombings still went to hospitals to give blood. he will talk about this tragedy and also talk about how this sort of has brought out the best of some of the folks in boston. he is also the commander in chief, that means the investigation of the boston bombings stops with him. he address

disagree withtheobama's administrationdecision to rule out enemy combatant suspect. >> reporter: labeling him as an enemy combatant would allow the government to question him without an attorney president and maybe get some of those answers. barbara starr, cnn, the pentagon. >> thanks, barbara. most of us can't even begin to imagine the incredibly tense moments that led up to the arrest of dzhokhar cztsarnaev. but that's what they are trained to do. the s.w.a.t team that took tsarnaev into custody describes the final moments to anderson cooper. let's listen. >> let's do it. let's do what we're trained to do. this is the suspect. we're trained to go in and apprehend him. you can see one hand is clear of any weapons each time he went the other way, his hand went down inside the boat out of our view. i know everybody here we've spoken about it. each time he did that, we had to assume he was reaching for either a weapon, a firearm or some explosive ignition device to kind of draw us in and take us out in a suicide type manner. he did that a couple of times as we're still approaching